Energy to Wavelength
Calculate wavelength from photon energy or vice versa instantly.
Common Energy-Wavelength Pairs
| Energy (eV) | Wavelength (nm) | Light Color | Application |
|---|---|---|---|
| 1.77 | 700 | Red | Laser pointers |
| 2.07 | 600 | Orange | LED displays |
| 2.48 | 500 | Green | Fluorescence |
| 3.10 | 400 | Violet | UV spectroscopy |
| 1240 | 1 | X-ray | Medical imaging |
Formula and Calculation Steps
The relation follows Planck-Einstein equation: \( E = \frac{hc}{\lambda} \), where \( h = 4.1356677 \times 10^{-15} \) eV·s (Planck’s constant), \( c = 3 \times 10^8 \) m/s (speed of light).
- Choose energy unit and enter value.
- Convert to eV if needed (1 J = \( 6.241509 \times 10^{18} \) eV).
- Compute \( \lambda = \frac{1240}{E} \) nm (for eV input).
- Adjust for output unit.
Electromagnetic Spectrum View
Physics and Chemistry Contexts
- Laser diode design matches energy to emission wavelength.
- Astronomy spectra analysis identifies stellar energies.
- Quantum dot sizing tunes bandgap energy-wavelength.
- Photovoltaics optimize solar cell absorption peaks.
Global Science Practices
European labs favor Joules and meters; US research uses eV and nm routinely. Asian semiconductor firms standardize on μm for IR ranges.
Frequent Questions
References
- Omni Calculator. “Energy to Wavelength Calculator.” https://www.omnicalculator.com/physics/energy-to-wavelength
- KM Labs. “Wavelength to Photon Energy Calculator.” https://www.kmlabs.com/en/wavelength-to-photon-energy-calculator
- Reusch, W. “Spectral Calculations.” Michigan State University, https://www2.chemistry.msu.edu/faculty/reusch/virttxtjml/cnvcalc.htm
- Planck, M. “On the Law of Distribution of Energy in the Normal Spectrum.” Annalen der Physik, 1901.